Malicious PDF — malware analysis report

Static analysis result for SHA-256 c299be3c966953dd…

MALICIOUS

PDF

88.1 KB Created: 2021-09-02 06:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a16150d30d0337ccc3fe752312523280 SHA-1: 23c994e0d876957654a411af7df2178eddafa806 SHA-256: c299be3c966953ddde2f71f79931d3c5691ad9aa3dc4ff1e439dc94b31bf2067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting, designed to trick users into downloading further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vmwarts.com/ecovic/file/67040896464.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ea496b885---dawakagefasezafevi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/778d0406648e4f53486c69fdc9663542/ruwidixukotu.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095fab6be821---tedos.pdfIn PDF document text
    • https://lasanisports.com/files/59799764962.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01a275680---31583332547.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/9jr34ri916gh49tvm7prs9kj8f/65499826276.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed36ed0aab---pisuradutepewigazivuka.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/jutuxetitu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wuvevefomopifurozo.pdfIn PDF document text
    • http://didopack.com/files/walexatovuvadopogikub.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2q7n101doq2l901bkku5epd135/jiwenizavobozojubogop.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/50912203804.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cd3cbb905---torixadawivike.pdfIn PDF document text
    • http://techmechengineers.com/uploads/76693964233.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb888e8131---6053076780.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/14920448349.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/ronuruderowazexu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/53c845d4588b100cc6cf38f25c661fa0/bidepolupedoso.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/wurotevevexizutuvelurava.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wazomo.pdfIn PDF document text
    • http://fitviewer.biz/files/file/89199066861.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eeaefc71b2---barimerivimegonugutajojil.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4980770961---19174262381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=diary+of+a+wimpy+kid+movie+free+online+no+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 10752 bytes
SHA-256: b42ae28428a3702a60d259abf6e2af367686748a09ed94000d66c5d55e3b2ecf
font_01_sfnt_off00010c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 17924 bytes
SHA-256: 39ef37ef818d55ecc082af85517023e761efabba4f0ff1a7e14672de059c39d9

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